the experience is detailed in the OMF(gdmf)G thread, i suggested that questions about the ROA be discussed separately, so here it is..

How did you prepare the fumarate and ensure purity? What pH did you get? What salt concentration? Where these biological conditions? Thanks.

I spent 2 decades of my life putting anything that was called meth into my veins by very crude standards, without ever needing to get medical attention, that was long ago. But my standards for perfection are far from what a first time safety oriented person..
White, clean naphtha pulled spice, re-x 2 times, naphtha, spice saturated acetone vs. Fasa. Immediate precip, 20 minutes maybe. Decant, wash 2x with fresh acetone, dry.

Spoon water cotton, the onset was slow, i had all caps on and safely put away with no problem...duration????? Quick as lightening, its by far the fastest return to baseline. Otherwise, i see no advantages to IV over vaporizing. Unless I suppose you wanted to attempt more than you are able to smoke, but that is a ridiculous idea.